1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_STRING_HELPERS_H_
3 #define _LINUX_STRING_HELPERS_H_
5 #include <linux/bits.h>
6 #include <linux/ctype.h>
7 #include <linux/string.h>
8 #include <linux/types.h>
13 /* Descriptions of the types of units to
15 enum string_size_units {
16 STRING_UNITS_10, /* use powers of 10^3 (standard SI) */
17 STRING_UNITS_2, /* use binary powers of 2^10 */
20 void string_get_size(u64 size, u64 blk_size, enum string_size_units units,
23 #define UNESCAPE_SPACE BIT(0)
24 #define UNESCAPE_OCTAL BIT(1)
25 #define UNESCAPE_HEX BIT(2)
26 #define UNESCAPE_SPECIAL BIT(3)
27 #define UNESCAPE_ANY \
28 (UNESCAPE_SPACE | UNESCAPE_OCTAL | UNESCAPE_HEX | UNESCAPE_SPECIAL)
30 #define UNESCAPE_ALL_MASK GENMASK(3, 0)
32 int string_unescape(char *src, char *dst, size_t size, unsigned int flags);
34 static inline int string_unescape_inplace(char *buf, unsigned int flags)
36 return string_unescape(buf, buf, 0, flags);
39 static inline int string_unescape_any(char *src, char *dst, size_t size)
41 return string_unescape(src, dst, size, UNESCAPE_ANY);
44 static inline int string_unescape_any_inplace(char *buf)
46 return string_unescape_any(buf, buf, 0);
49 #define ESCAPE_SPACE BIT(0)
50 #define ESCAPE_SPECIAL BIT(1)
51 #define ESCAPE_NULL BIT(2)
52 #define ESCAPE_OCTAL BIT(3)
54 (ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_SPECIAL | ESCAPE_NULL)
55 #define ESCAPE_NP BIT(4)
56 #define ESCAPE_ANY_NP (ESCAPE_ANY | ESCAPE_NP)
57 #define ESCAPE_HEX BIT(5)
58 #define ESCAPE_NA BIT(6)
59 #define ESCAPE_NAP BIT(7)
60 #define ESCAPE_APPEND BIT(8)
62 #define ESCAPE_ALL_MASK GENMASK(8, 0)
64 int string_escape_mem(const char *src, size_t isz, char *dst, size_t osz,
65 unsigned int flags, const char *only);
67 static inline int string_escape_mem_any_np(const char *src, size_t isz,
68 char *dst, size_t osz, const char *only)
70 return string_escape_mem(src, isz, dst, osz, ESCAPE_ANY_NP, only);
73 static inline int string_escape_str(const char *src, char *dst, size_t sz,
74 unsigned int flags, const char *only)
76 return string_escape_mem(src, strlen(src), dst, sz, flags, only);
79 static inline int string_escape_str_any_np(const char *src, char *dst,
80 size_t sz, const char *only)
82 return string_escape_str(src, dst, sz, ESCAPE_ANY_NP, only);
85 static inline void string_upper(char *dst, const char *src)
88 *dst++ = toupper(*src);
92 static inline void string_lower(char *dst, const char *src)
95 *dst++ = tolower(*src);
99 char *kstrdup_quotable(const char *src, gfp_t gfp);
100 char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp);
101 char *kstrdup_quotable_file(struct file *file, gfp_t gfp);
103 void kfree_strarray(char **array, size_t n);